Aplikasi Trichoderma harzianum dan Fungi Mikoriza Arbuskula (FMA) terhadap Pertumbuhan Kangkung Darat (Ipomoea reptans poir) pada Media Tanah Gambut dalam Polybag

Abstract

DEWI NUR IMAN NAZARA, Application of Trichoderma harzianum and Arbuscular Mycorrhizal Fungi (AMF) on the growth of land spinach (Ipomoea reptans poir) on peat soil media in polybags, (under the guidance of Prof. Dr. Ir. Mariani br Sembiring, SP., MP, as the advisory committee). This study aims to determine the effect of T. harzianum and Arbuscular Mycorrhizal Fungi (AMF) applications, either singly or in combination, on the growth of land spinach (Ipomoea reptans Poir) on peat soil. The study was conducted in Lawira Satua Village, Lotu District, North Nias Regency, North Sumatra Province, and continued in the soil biology laboratory of the University of North Sumatra. With a randomized experimental design using 5 x 5 cm polybags and different dose treatments for T. harzianum, T0 (0 g), T1 (5 g), T2 (10 g), T3 (15 g), T4 (20 g) and AMF, M0 (0 g), M1 (5 g), M2 (10 g), M3 (15 g), M4 (20 g). The parameters observed included soil pH, plant height, number of leaves, fresh weight, dry weight, microbial population, degree of root infection, and microbial respiration. The results showed that T. harzianum application increased plant height and leaf number in the early growth phase, although it had no significant effect on biomass. AMF inoculation tended to increase fresh weight, dry weight, and leaf number, especially at doses of 10–15 g, along with increased root colonization. The interaction of T. harzianum and AMF was more effective in increasing the degree of root infection, plant height, and leaf number in the vegetative phase compared to single treatments, although the effect was not significant for all parameters. In general, the application of T. harzianum at a dose of 20 g and the interaction with AMF at a dose of 10–15 g has the potential to be applied to land kale cultivation on peat soils. However, the limitations of acidic and nutrient-poor peat soils still limit the effectiveness of biological inoculants, so further research is needed regarding the optimal dose and interaction with other organic fertilizers.